Abstract : The effect of repeated exposure of the same individual to short periods of sensory deprivation and isolation was evaluated. Behavioral and physiological responses were measured and their relationship to modification of visual input det rmi ed. The results suggest that physiological adaptation to isolation continues over several sessions. The presence of visual imagery in a subject appeared to be related to the individual personality, and not to the condition of deprivation. Au itory and somesthetic imagery appeared to be related to the type of deprivatio . Body mov ment response was negatively related to the amount of imagery. The findings point up the importance of non-imagery factors as measures of stress and the importance of a sessing individual differences in imagery responses under conditions of isolation. (Author)